- Integrate pdf-tools.cc with the rest of the code
- What if an input page specifies /Rotate?
- Better error messages from instantiation
- page->index: use or remove
- rename page->bbox to page->image_box?

| # Position bbox on a new paper
| paper("a4")
| paper(w=210mm,h=297mm,pos=(t|b|c)(l|r|c))

| # Scale paper to a new size
| scaleto("a4")
| scaleto(w=210mm,h=297mm,pos=tl)

| # Fit image to a paper
| # If paper is given: scale image
| # If no paper is given: adjust paper to image + margins
| fit("a4")
| fit(w=, h=)
| margin= hmargin= vmargin=
| lmargin= rmargin= tmargin= bmargin=
| pos=

| # Adjust paper size
| expand(10mm)
| expand(h=10mm, v=20mm)
| expand(l=10mm, r=10mm, t=10mm, b=10mm)

| # Adjust image size (in terms of margins around)
| margins ... params like expand

cropmarks
	style=box	# Box around image
	style=cross	# Crosses in the corners
	style=halfcross	# Half-crosses in the corners (default)
	pen=1pt		# Line width
	len=5mm		# Cross arm length
	dist=5mm	# Distance from border

book
	signature=<n>

# Crop to image box
crop
	bleed=5mm	# Allow bleeding over the image box

duplex
	long-edge

| merge

modulo
	half

# Add an empty page after the current one
add-blank

# Set either:
#	- paper size + margins
#	- scale + margins
nup(hnum, vnum)
	paper / w / h	# Specify paper size, default=copy from 1st image
	+ fit options (*margin, pos)
	crop		# Crop to image
	rotate=1	# Override rotation decision
	scale=1		# Override scaling factor
	tile		# Tile with copies of a single page
	hspace / vspace / space	# Distance between tiles
	+ cropmarks?